俞

Glyph origin
In oracle bone script, it was likely a : semantic + phonetic inverted. It's also possible that the phonetic component is instead an ancient form of. In bronze inscriptions, corrupted into, and the bottom-right subcomponent gradually corrupted into two lines (now written ). The upper-right subcomponent moved to the top of the character in bamboo slips, and  was further corrupted into, arriving at the modern form.

Definitions

 * 1) to approve; to consent
 * 2) yes
 * 3) to reply; to respond
 * 4)  satisfied; at ease